Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d234dd232cbd881…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 20:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb24c4fd256c23213eae0f0c417d06c4 SHA-1: 6f41b24fd56fd29d92afc7cc7c38882bb3d89b32 SHA-256: 6d234dd232cbd881623bd8911d20c47463eeab53e95f226a5b44f113fbbfdc79
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to obscure the final destination. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is a pretext for financial fraud. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=icloud+messages+to+android PDF link annotation
    • https://lolakarimova.uz/ckfinder/userfiles/files/97003421415.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/rodam.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/6307491449.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/75419403355.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/9746364913.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/ridijomufefizaxewedawaf.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/38280283194.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4d50cb8e1---90632356895.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/danulubitar.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/42192685282.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/56760800162.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/ripagufinepuxafepuzuzatit.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075c08a92f---43442270607.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/45757534140.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vl3704sihnf5h4vukcfduf4jpv/dajoka.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/nobajeragos.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/17499444895.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde000e564---64926089219.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/89235178817.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/89971990550.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 17724 bytes
SHA-256: c3642e1c69a51afb4901aecdd3aa3a9dfa407cff2c99ae4e9aed6c8f14a38f22
font_01_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 10764 bytes
SHA-256: b7e5168decf7c7a916de8c921878ff2355ce7d18fce7ae7f6456e358e5b09f7c